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GNC 420/420A Quick Reference
190-00140-21 Rev. F
FREQUENCY SELECTION
5
Selecting a frequency:
1) Turn the large left knob to select the desired
megahertz (MHz) value. For example, the ‘135’
portion of the frequency ‘135.325’.
2) Turn the small left knob to select the desired
kilohertz (kHz) value. For example, the ‘.325’
portion of the frequency ‘135.325’.
3) To activate the selected frequency, press the
COM Flip-flop Key.
Quickly tuning and activating the 121.500
emergency channel:
Press and hold the COM Flip-flop Key for
approximately two seconds.
DATA ENTRY
Data is entered in the GPS Window using the large and
small right knobs. The large right knob is used to move
the cursor about the page. The small right knob is used
to select individual characters for the highlighted cursor
location.